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'''MediaWiki has been successfully installed.'''
 
'''MediaWiki has been successfully installed.'''
  
Consult the [http://meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.
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Consult the [https://meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.
  
 
== Getting started ==
 
== Getting started ==
  
* [http://www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]
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* [https://www.mediawiki.org/wiki/Manual:Configuration_settings Configuration settings list]
* [http://www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]
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* [https://www.mediawiki.org/wiki/Manual:FAQ MediaWiki FAQ]
 
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
 
* [https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
 
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from 04:00 JST (UTC+0900) to 21:00 JST (UTC+0900), Sat, 16 November 2019.
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from 12:00 JST (UTC+0900) to 13:00 JST (UTC+0900), Tuesday, June 28, 2022.
 
All services on pgpool.net will be unavailable for the maintenance period.
 
All services on pgpool.net will be unavailable for the maintenance period.
 
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= Welcome to Pgpool Wiki! =
 
= Welcome to Pgpool Wiki! =
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== What is Pgpool-II? ==
 
== What is Pgpool-II? ==
  
Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It is licensed under BSD license. It provides the following features.
+
Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It is distributed under a license similar to BSD and MIT. It provides the following features.
  
 
* '''Connection Pooling'''
 
* '''Connection Pooling'''
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== Pgpool-II License ==
 
== Pgpool-II License ==
  
See [http://pgpool.net/mediawiki/index.php/pgpool-II_License License].
+
See [https://pgpool.net/mediawiki/index.php/pgpool-II_License License].
  
 
== Stable versions ==
 
== Stable versions ==
  
* Pgpool-II: 4.0, 3.7, 3.6, 3.5, 3.4
+
* Pgpool-II: 4.4, 4.3, 4.2, 4.1, 4.0, 3.7
* pgpoolAdmin: 4.0, 3.7, 3.6, 3.5, 3.4
+
* pgpoolAdmin: 4.2, 4.1, 4.0, 3.7
  
 
== Contacts ==
 
== Contacts ==
  
* If you have technical questions regarding Pgpool-II, please subscribe [http://pgpool.net/mediawiki/index.php/Mailing_lists Pgpool-II mailing lists] and send questions to it (pgpool-general will be a starter). Please '''do not''' send technical questions via private email. We will not respond such that messages.
+
* If you have technical questions regarding Pgpool-II, please subscribe [https://pgpool.net/mediawiki/index.php/Mailing_lists Pgpool-II mailing lists] and send questions to it (pgpool-general will be a starter). Please '''do not''' send technical questions via private email. We will not respond such that messages.
  
 
* If you believe that you found a vulnerability/security issues with Pgpool-II, please send a '''private email''' to ishii at sraoss.co.jp (he is the project leader).
 
* If you believe that you found a vulnerability/security issues with Pgpool-II, please send a '''private email''' to ishii at sraoss.co.jp (he is the project leader).
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== News ==
 
== News ==
  
=== Pgpool-II 4.1.0 released (2019/10/31) ===
+
=== Pgpool-II 4.4.0 released (2022/12/06) ===
 +
 
 +
Pgpool-II 4.4.0 is now released. This is the first stable release of Pgpool-II 4.4.x.
  
Pgpool-II 4.1.0 is now relased.
+
V4.4 contains new features and enhancements, including:
  
Major enhancements in Pgpool-II 4.1 include:
+
* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  
* Statement level load balancing.
+
* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
* Auto failback.
 
* Enhance performance in number of areas.
 
** Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
 
** Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
 
** Load balancing control for specific queries.
 
* Reduce Internal Queries against System Catalogs.
 
* Import PostgreSQL 12 SQL parser.  
 
* etc.
 
  
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
+
* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  
Release notes:
+
* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
[https://www.pgpool.net/docs/latest/en/html/ English]
 
[https://www.pgpool.net/docs/latest/ja/html/ Japanese]
 
  
=== Pgpool-II 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 officially released (2019/10/31) ===
+
* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  
Pgpool-II 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 officially released
+
* Import PostgreSQL 15's SQL parser.
  
Please note that 3.4.26 is the last release of 3.4 series
+
* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.  
because 5 years has passed since 3.4 was out (2014/11).
 
  
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download it from [https://www.pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.0.7 : [https://www.pgpool.net/docs/latest/en/html/release-4-0-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-6.html Japanese]
+
Release notes:
* 3.7.12 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-11.html Japanese]
+
[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English] [https://www.pgpool.net/docs/44/ja/html/release-4-4-0.html Japanese]
* 3.6.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-18.html Japanese]
 
* 3.5.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-22.html Japanese]
 
* 3.4.26:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-25.html Japanese]
 
  
 
== Events ==
 
== Events ==
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Tatsuo Ishii and Bo Peng are going to give a presentation  
 
Tatsuo Ishii and Bo Peng are going to give a presentation  
[http://www.pgpool.net/download.php?f=pgpool-past-now-and-future.pdf Celebrating its 15th Anniversary Pgpool-II Past Present and Future]
+
[https://www.pgpool.net/download.php?f=pgpool-past-now-and-future.pdf Celebrating its 15th Anniversary Pgpool-II Past Present and Future]
[http://www.pgpool.net/download.php?f=pgpool-past-now-and-future-part2.pdf Celebrating its 15th Anniversary Pgpool-II Past Present and Future part2] at [http://www.pgconf.asia/EN/2018/day1/#B4 "PGConf.ASIA 2018"] held in Tokyo from December 10th to 12th.
+
[https://www.pgpool.net/download.php?f=pgpool-past-now-and-future-part2.pdf Celebrating its 15th Anniversary Pgpool-II Past Present and Future part2] at [https://www.pgconf.asia/EN/2018/day1/#B4 "PGConf.ASIA 2018"] held in Tokyo from December 10th to 12th.
  
 
=== PGConf.ASIA 2017 in Tokyo ===
 
=== PGConf.ASIA 2017 in Tokyo ===
  
Tatsuo Ishii is going to give a presentation  [http://www.pgconf.asia/EN/2017/day-2/#B5 "More reliability and support for PostgreSQL 10: Introducing Pgpool-II 3.7"] at [http://www.pgconf.asia/EN/2017/ "PGConf.ASIA 2017"], held in Tokyo from December 4th to 6th.
+
Tatsuo Ishii is going to give a presentation  [https://www.pgconf.asia/EN/2017/day-2/#B5 "More reliability and support for PostgreSQL 10: Introducing Pgpool-II 3.7"] at [https://www.pgconf.asia/EN/2017/ "PGConf.ASIA 2017"], held in Tokyo from December 4th to 6th.
  
 
=== PostgreSQL Conference in Russia 2016 ===
 
=== PostgreSQL Conference in Russia 2016 ===
  
 
Tatsuo gave a talk "How to manage a herd of elephants" at [https://pgconf.ru/en "PostgreSQL Conference in Russia 2016"], held in Moscow from February 4th to 5th.
 
Tatsuo gave a talk "How to manage a herd of elephants" at [https://pgconf.ru/en "PostgreSQL Conference in Russia 2016"], held in Moscow from February 4th to 5th.
The slides are available in [http://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
+
The slides are available in [https://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
  
 
=== PostgreSQL Conference in China 2015 ===
 
=== PostgreSQL Conference in China 2015 ===
  
Tatsuo gave a talk "How to manage a herd of elephants" at [http://www.eventdove.com/event/106042 "PostgreSQL Conference in China 2015"], held in Beijing from November 21th to 22th.
+
Tatsuo gave a talk "How to manage a herd of elephants" at [https://www.eventdove.com/event/106042 "PostgreSQL Conference in China 2015"], held in Beijing from November 21th to 22th.
The slides are available in [http://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
+
The slides are available in [https://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
  
 
=== pgCon 2015 Cluster Hacker Summit ===
 
=== pgCon 2015 Cluster Hacker Summit ===
  
We participated "6th Postgres Cluster Hacker Summit" which was held as a part of PgCon 2015 Developer Unconference. We reported about Development Status Updates and pgpool-II 3.5 features. The slides are available in [http://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
+
We participated "6th Postgres Cluster Hacker Summit" which was held as a part of PgCon 2015 Developer Unconference. We reported about Development Status Updates and pgpool-II 3.5 features. The slides are available in [https://pgpool.net/mediawiki/index.php/Documentation#Developer.27s_documentation Developer's documentation].
  
 
=== Pgpool-II Day 2015 in Tokyo ===
 
=== Pgpool-II Day 2015 in Tokyo ===
  
We had the very first time pgpool-II decicated conference. See the [http://pgpool.net/mediawiki/index.php/pgpool-II_Day_2015 event report].
+
We had the very first time pgpool-II decicated conference. See the [https://pgpool.net/mediawiki/index.php/pgpool-II_Day_2015 event report].
 +
 
 +
== Stable ==
 +
 
 +
=== Pgpool-II 4.4.0 released (2022/12/06) ===
 +
 
 +
Pgpool-II 4.4.0 is now released. This is the first stable release of Pgpool-II 4.4.x.
  
== New docs ==
+
V4.4 contains new features and enhancements, including:
  
=== pgpool-II 3.5 is coming soon! ===
+
* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  
pgpool-II 3.5 alpha1 has been out. Tatsuo introduces [http://pgpool.net/mediawiki/index.php?title=pgpool-II_3.5_features&redirect=no "new features of pgpool-II 3.5."]
+
* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  
== Stable ==
+
* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  
=== Pgpool-II 4.1.0 released (2019/10/31) ===
+
* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  
Pgpool-II 4.1.0 is now relased.  
+
* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  
Major enhancements in Pgpool-II 4.1 include:
+
* Import PostgreSQL 15's SQL parser.
  
* Statement level load balancing.
+
* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.  
* Auto failback.
 
* Enhance performance in number of areas.
 
** Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
 
** Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
 
** Load balancing control for specific queries.
 
* Reduce Internal Queries against System Catalogs.
 
* Import PostgreSQL 12 SQL parser.
 
* etc.
 
  
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download it from [https://www.pgpool.net/mediawiki/index.php/Downloads here].
  
 
Release notes:
 
Release notes:
[https://www.pgpool.net/docs/latest/en/html/ English]
+
[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English] [https://www.pgpool.net/docs/44/ja/html/release-4-4-0.html Japanese]
[https://www.pgpool.net/docs/latest/ja/html/ Japanese]
+
 
 +
=== Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released (2022/08/18) ===
 +
 
 +
Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released.
 +
 
 +
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
=== Pgpool-II 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 officially released (2019/10/31) ===
+
* 4.3.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-3.html Japanese]
 +
* 4.2.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-10.html Japanese]
 +
* 4.1.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-13.html Japanese]
 +
* 4.0.20 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-20.html Japanese]
 +
* 3.7.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-25.html Japanese]
  
Pgpool-II 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 officially released
+
=== Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released (2022/05/19) ===
  
Please note that 3.4.26 is the last release of 3.4 series
+
Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released.
because 5 years has passed since 3.4 was out (2014/11).
 
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.0.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-6.html Japanese]
+
* 4.3.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-2.html Japanese]
* 3.7.12 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-11.html Japanese]
+
* 4.2.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-9.html Japanese]
* 3.6.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-18.html Japanese]
+
* 4.1.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-12.html Japanese]
* 3.5.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-22.html Japanese]
+
* 4.0.19 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-19.html Japanese]
* 3.4.26:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-25.html Japanese]
+
* 3.7.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-24.html Japanese]
  
=== Pgpool-II 4.0.6, 3.7.11, 3.6.18, 3.5.22 and 3.4.25 officially released (2019/08/15) ===
+
=== Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released (2022/02/17) ===
  
Pgpool-II 4.0.6, 3.7.11, 3.6.18, 3.5.22 and 3.4.25 officially released
+
Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.0.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-6.html Japanese]
+
* 4.3.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-3-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-3-1.html Japanese]
* 3.7.11 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-11.html Japanese]
+
* 4.2.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-8.html Japanese]
* 3.6.18 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-18.html Japanese]
+
* 4.1.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-11.html Japanese]
* 3.5.22 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-22.html Japanese]
+
* 4.0.18 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-18.html Japanese]
* 3.4.25:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-25.html Japanese]
+
* 3.7.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-23.html Japanese]
 +
 
 +
=== Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released (2021/12/23) ===
  
=== Pgpool-II 4.0.5, 3.7.10, 3.6.17, 3.5.21 and 3.4.24 officially released (2019/05/16) ===
+
Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released.
  
Pgpool-II 4.0.5, 3.7.10, 3.6.17, 3.5.21 and 3.4.24 officially released
+
The purpose of this release is to provide packages for PostgreSQL 14.
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 4.0.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-5.html Japanese]
+
* 4.2.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-7.html Japanese]
* 3.7.10 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-10.html Japanese]
+
* 4.1.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-10.html Japanese]
* 3.6.17 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-17.html Japanese]
+
* 4.0.17 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-17.html Japanese]
* 3.5.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-21.html Japanese]
+
* 3.7.22 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-22.html Japanese]
* 3.4.24:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-24.html Japanese]
 
  
=== Pgpool-II 4.0.4, 3.7.9, 3.6.16, 3.5.20 and 3.4.23 officially released (2019/03/29) ===
+
=== Pgpool-II 4.3.0 released (2021/12/07) ===
  
Pgpool-II 4.0.4, 3.7.9, 3.6.16, 3.5.20 and 3.4.23 officially released
+
Pgpool-II 4.3.0 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3-0.html 4.3.0]
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
V4.3.0 contains new features and enhancements, including:
 +
* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  
* 4.0.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-4.html Japanese]
+
* Allow to choose the least replication delay standby node when selecting the load balance node.  
* 3.7.9 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-9.html Japanese]
 
* 3.6.16 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-16.html Japanese]
 
* 3.5.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-20.html Japanese]
 
* 3.4.23:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-23.html Japanese]
 
  
=== Pgpool-II 4.0.3, 3.7.8, 3.6.15, 3.5.19 and 3.4.22 officially released (2019/02/21) ===
+
* Allow to specify the node id to be promoted in pcp_promote_node.  
  
Pgpool-II 4.0.3, 3.7.8, 3.6.15, 3.5.19 and 3.4.22 officially released
+
* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.  
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  
* 4.0.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-3.html Japanese]
+
* Allow pcp_node_info to list all backend nodes information.
* 3.7.8 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-8.html Japanese]
 
* 3.6.15 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-15.html Japanese]
 
* 3.5.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-19.html Japanese]
 
* 3.4.22:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-22.html Japanese]
 
  
=== pgpoolAdmin 4.0.1 officially released (2018/12/20) ===
+
* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  
PgPool Global Development Group has released a Security Update of pgpoolAdmin.
+
* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.  
  
The purpose of this release is to address CVE-2018-16203, which
+
* Add support for log time stamp with milliseconds.
allow an attacker to login without properly checking the authorization.
 
Once getting into gpoolAdmin, the attacker can control Pgpool-II.
 
Also it may be possible to obtain the superuser role of a PostgreSQL database.  
 
  
This vulnability affects all versions of pgpoolAdmin. We recommend
+
* Import PostgreSQL 14's SQL parser.
upgrade pgpoolAdmin to 4.0.1 immediately (remember that PgpoolAdmin
 
4.0.1 is compatible with Pgpool-II 3.4 or later).
 
  
PgPool Global Development Group would like to thank Fotios Rogkotis
+
* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
of DarkMatter for finding the security issue and giving us the
 
detailed studies on it.  
 
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* pgpool.conf sample files are unified into single sample file for easier configuration.
  
=== Pgpool-II 4.0.2, 3.7.7, 3.6.14, 3.5.18 and 3.4.21 officially released (2018/11/22) ===
+
* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
  
Pgpool-II 4.0.2, 3.7.7, 3.6.14, 3.5.18 and 3.4.21 officially released
+
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
Release notes:
 +
[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
  
* 4.0.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-2.html Japanese]
+
=== Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released (2021/11/18) ===
* 3.7.7 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-7.html Japanese]
 
* 3.6.14 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-14.html Japanese]
 
* 3.5.18 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-18.html Japanese]
 
* 3.4.21:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-21.html Japanese]
 
  
=== Pgpool-II 4.0.1, 3.7.6, 3.6.13, 3.5.17 and 3.4.20 officially released (2018/10/31) ===
+
Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released.
  
Pgpool-II 4.0.1, 3.7.6, 3.6.13, 3.5.17 and 3.4.20 officially released
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* 4.2.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-6.html Japanese]
 +
* 4.1.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-9.html Japanese]
 +
* 4.0.16 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-16.html Japanese]
 +
* 3.7.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-21.html Japanese]
 +
* 3.6.28 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-28.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-28.html Japanese]
  
* 4.0.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-1.html Japanese]
+
=== Pgpool-II 4.2.5 released (2021/09/14) ===
* 3.7.6 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-6.html Japanese]
 
* 3.6.13 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-13.html Japanese]
 
* 3.5.17 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-17.html Japanese]
 
* 3.4.20:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-20.html Japanese]
 
  
=== Pgpool-II 4.0.0 and pgpoolAdmin 4.0.0 officially released (2018/10/19) ===
+
Pgpool Global Development Group is pleased to announce the availability of Pgpool-II 4.2.5.
  
Pgpool-II 4.0.0 and pgpoolAdmin 4.0.0 are now relased.  
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
V4.0 has new features:
+
* 4.2.5 : [https://www.pgpool.net/docs/latest/en/html/release-4-2-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-5.html Japanese]
  
* Add SCRAM and Certificate authentication support.
+
=== Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released (2021/08/05) ===
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.  
 
* Add last state change timestamp to SHOW POOL NODES.
 
* Import PostgreSQL 11 SQL parser.  
 
* Logging client messages.  
 
* etc.
 
  
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
+
Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released.
  
Release notes:
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
[https://www.pgpool.net/docs/latest/en/html/release-4-0.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0.html Japanese]
 
  
=== Pgpool-II 3.7.5, 3.6.12, 3.5.16, 3.4.19 and 3.3.22 officially released (2018/07/31) ===
+
* 4.2.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-4.html Japanese]
 +
* 4.1.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-8.html Japanese]
 +
* 4.0.15 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-15.html Japanese]
 +
* 3.7.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-20.html Japanese]
 +
* 3.6.27 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-27.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-27.html Japanese]
  
Pgpool-II 3.7.5, 3.6.12, 3.5.16, 3.4.19 and 3.3.22 officially released
+
=== pgpoolAdmin 4.2.0 officially released (2021/06/17) ===
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
pgpoolAdmin 4.2.0 officially released.
  
* 3.7.5 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-5.html Japanese]
+
pgpoolAdmin 4.2.0 adds support for Pgpool-II 4.2.
* 3.6.12 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-12.html Japanese]
+
Please take a look at [https://www.pgpool.net/docs/pgpoolAdmin/NEWS release notes].
* 3.5.16 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-16.html Japanese]
 
* 3.4.19:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-19.html Japanese]
 
* 3.3.22:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-22.html Japanese]
 
  
Please note that 3.3.22 is the last release of 3.3 series because 5 years has passed since 3.3 was out (2013/07/30).
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
=== Pgpool-II 3.7.4, 3.6.11, 3.5.15 and 3.4.18 officially released (2018/06/12) ===
+
=== Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released (2021/05/20) ===
  
Pgpool-II 3.7.4, 3.6.11, 3.5.15 and 3.4.18 officially released
+
Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.7.4 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-4.html Japanese]
+
* 4.2.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-3.html Japanese]
* 3.6.11 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-11.html Japanese]
+
* 4.1.7 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-7.html Japanese]
* 3.5.15 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-15.html Japanese]
+
* 4.0.14 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-14.html Japanese]
* 3.4.18:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-18.html Japanese]
+
* 3.7.19 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-19.html Japanese]
 +
* 3.6.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-26.html Japanese]
  
=== Pgpool-II 3.7.3, 3.6.10, 3.5.14, 3.4.17 and 3.3.21 officially released (2018/04/17) ===
+
=== Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released (2021/02/18) ===
  
Pgpool-II 3.7.3, 3.6.10, 3.5.14, 3.4.17 and 3.3.21 officially released
+
Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.7.3 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-3.html Japanese]
+
* 4.2.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-2.html Japanese]
* 3.6.10 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-10.html Japanese]
+
* 4.1.6 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-6.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-6.html Japanese]
* 3.5.14 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-14.html Japanese]
+
* 4.0.13 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-13.html Japanese]
* 3.4.17:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-17.html Japanese]
+
* 3.7.18 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-18.html Japanese]
* 3.3.21:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-21.html Japanese]
+
* 3.6.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-25.html Japanese]
  
=== Pgpool-II 3.7.2-2 RPMs are released. (2018/03/14) ===
+
=== Pgpool-II 4.2.1 released (2020/12/23) ===
  
Pgpool-II 3.7.2-2 RPMs are released.
+
Pgpool-II 4.2.1 is now released.  
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download them from [https://pgpool.net/mediawiki/index.php/Downloads here].
  
=== Pgpool-II 3.7.2, 3.6.9, 3.5.13, 3.4.16 and 3.3.20 officially released (2018/02/13) ===
+
* 4.2.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-2-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-2-1.html Japanese]
  
Pgpool-II 3.7.2, 3.6.9, 3.5.13, 3.4.16 and 3.3.20 officially released
+
=== Pgpool-II 4.2.0 released (2020/11/26) ===
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
Pgpool-II 4.2.0 is now released.  
  
* 3.7.2 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-2.html Japanese]
+
V4.2 contains new features and enhancements, including:
* 3.6.9 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-9.html Japanese]
 
* 3.5.13 : [https://www.pgpool.net/docs/latest/en/html/release-3-5-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-13.html Japanese]
 
* 3.4.16:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-16.html Japanese]
 
* 3.3.20:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-20.html Japanese]
 
  
=== pgpoolAdmin 3.7.1 officially released (2018/02/05) ===
+
* Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  
pgpoolAdmin 3.7.1 is officially released.
+
* Implement logging_collector for easier log management.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Implement log_disconnections to collect disconnection logs.
  
[http://www.pgpool.net/docs/pgpoolAdmin/NEWS Release notes]
+
* Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  
=== Pgpool-II 3.7.1, 3.6.8, 3.5.12, 3.4.15 and 3.3.19 officially released (2018/01/09) ===
+
* Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  
Pgpool-II 3.7.1, 3.6.8, 3.5.12, 3.4.15 and 3.3.19 officially released
+
* New PCP command pcp_reload_config is added.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  
* 3.7.1 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-1.html Japanese]
+
* Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
* 3.6.8 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-8.html Japanese]
 
* 3.5.12 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-12.html Japanese]
 
* 3.4.15:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-15.html Japanese]
 
* 3.3.19:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-19.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-19.html Japanese]
 
  
=== Pgpool-II 3.7.0 and pgpoolAdmin 3.7.0 officially released (2017/11/22) ===
+
* Support LDAP authentication between clients and Pgpool-II.
  
Pgpool-II 3.7.0 and pgpoolAdmin 3.7.0 are now relased.  
+
* Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  
V3.7 has new features:
+
* Import PostgreSQL 13's SQL parser.  
* Quorum aware failover feature.
 
* Allow specifying the hostnames in pool_hba.
 
* Allow to specify per node health check parameters.
 
* Support AWS Aurora.
 
* Import PostgreSQL 10 SQL parser.
 
* Support logical replication.
 
* etc.
 
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
  
 
Release notes:
 
Release notes:
[https://www.pgpool.net/docs/latest/en/html/release-3-7.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-7.html Japanese]
+
[https://www.pgpool.net/docs/42/en/html/release-4-2-0.html English]
 +
 
 +
=== Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released (2020/11/19) ===
 +
 
 +
Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released
 +
 
 +
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 +
 
 +
* 4.1.5 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-5.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-5.html Japanese]
 +
* 4.0.12 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-12.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-12.html Japanese]
 +
* 3.7.17 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-17.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-17.html Japanese]
 +
* 3.6.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-24.html Japanese]
 +
* 3.5.28 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-28.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-28.html Japanese]
 +
 
 +
=== Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released (2020/09/17) ===
 +
 
 +
Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released
 +
 
 +
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 +
 
 +
* 4.1.4 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-4.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-4.html Japanese]
 +
* 4.0.11 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-11.html Japanese]
 +
* 3.7.16 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-16.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-16.html Japanese]
 +
* 3.6.23 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-23.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-23.html Japanese]
 +
* 3.5.27 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-27.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-27.html Japanese]
 +
 
 +
=== Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released (2020/08/20) ===
 +
 
 +
Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released
 +
 
 +
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 +
 
 +
* 4.1.3 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-3.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-3.html Japanese]
 +
* 4.0.10 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-10.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-10.html Japanese]
 +
* 3.7.15 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-15.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-15.html Japanese]
 +
* 3.6.22 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-22.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-22.html Japanese]
 +
* 3.5.26 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-26.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-26.html Japanese]
  
=== Pgpool-II 3.6.7, 3.5.11, 3.4.14 and 3.3.18 officially released (2017/11/01) ===
+
=== Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released (2020/05/21) ===
  
Pgpool-II 3.6.7, 3.5.11, 3.4.14 and 3.3.18 officially released
+
Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.6.7 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-7.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-7.html Japanese]
+
* 4.1.2 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-2.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-2.html Japanese]
* 3.5.11 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-11.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-11.html Japanese]
+
* 4.0.9 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-9.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-9.html Japanese]
* 3.4.14:  [https://www.pgpool.net/docs/latest/en/html/release-3-4-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-4-14.html Japanese]
+
* 3.7.14 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-14.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-14.html Japanese]
* 3.3.18:  [https://www.pgpool.net/docs/latest/en/html/release-3-3-18.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-3-18.html Japanese]
+
* 3.6.21 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-21.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-21.html Japanese]
 +
* 3.5.25 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-25.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-25.html Japanese]
  
=== Pgpool-II 3.6.6, 3.5.10, 3.4.13, 3.3.17 and 3.2.22 officially released (2017/09/05) ===
+
=== Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released (2020/02/20) ===
  
Pgpool-II 3.6.6, 3.5.10, 3.4.13, 3.3.17, 3.2.22 and pgpoolAdmin 3.6.2 officially released
+
Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released
  
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
 
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.6.6 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-6.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-6.html Japanese]
+
* 4.1.1 :  [https://www.pgpool.net/docs/latest/en/html/release-4-1-1.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-1-1.html Japanese]
* 3.5.10 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-10.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-10.html Japanese]
+
* 4.0.8 :  [https://www.pgpool.net/docs/latest/en/html/release-4-0-8.html English] [https://www.pgpool.net/docs/latest/ja/html/release-4-0-8.html Japanese]
* 3.4.13:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-13.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-13.html Japanese]
+
* 3.7.13 :  [https://www.pgpool.net/docs/latest/en/html/release-3-7-13.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-7-13.html Japanese]
* 3.3.17:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-17.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-17.html Japanese]
+
* 3.6.20 :  [https://www.pgpool.net/docs/latest/en/html/release-3-6-20.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-6-20.html Japanese]
* 3.2.22:  [http://www.pgpool.net/docs/latest/en/html/release-3-2-22.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-22.html Japanese]
+
* 3.5.24 :  [https://www.pgpool.net/docs/latest/en/html/release-3-5-24.html English] [https://www.pgpool.net/docs/latest/ja/html/release-3-5-24.html Japanese]
  
=== Pgpool-II 3.6.5, 3.5.9, 3.4.12, 3.3.16 and 3.2.21 officially released (2017/07/11) ===
+
=== Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 officially released (2019/11/19) ===
  
Pgpool-II 3.6.5, 3.5.9, 3.4.12, 3.3.16 and 3.2.21 officially released
+
Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 are officially released.
 +
The updated RPM packages fixed the bug which logs are not output, when log_destination = 'syslog' is configured.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download them [https://pgpool.net/mediawiki/index.php/Downloads here].
  
* 3.6.5 :  [http://www.pgpool.net/docs/latest/en/html/release-3-6-5.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-5.html Japanese]
+
=== Pgpool-II 4.1.0 released (2019/10/31) ===
* 3.5.9 :  [http://www.pgpool.net/docs/latest/en/html/release-3-5-9.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-9.html Japanese]
 
* 3.4.12:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-12.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-12.html Japanese]
 
* 3.3.16:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-16.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-16.html Japanese]
 
* 3.2.21:  [http://www.pgpool.net/docs/latest/en/html/release-3-2-21.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-21.html Japanese]
 
  
=== Pgpool-II 3.6.4, 3.5.8 officially released (2017/05/11) ===
+
Pgpool-II 4.1.0 is now relased.  
  
Pgpool-II 3.6.4, 3.5.8 officially released
+
Major enhancements in Pgpool-II 4.1 include:
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Statement level load balancing.
 +
* Auto failback.
 +
* Enhance performance in number of areas.
 +
** Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
 +
** Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
 +
** Load balancing control for specific queries.
 +
* Reduce Internal Queries against System Catalogs.
 +
* Import PostgreSQL 12 SQL parser.
 +
* etc.
  
* 3.6.4:  [http://www.pgpool.net/docs/latest/en/html/release-3-6-4.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-4.html Japanese]
+
You can download it from [https://pgpool.net/mediawiki/index.php/Downloads here].
* 3.5.8:  [http://www.pgpool.net/docs/latest/en/html/release-3-5-8.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-8.html Japanese]
 
  
=== Pgpool-II 3.6.3, 3.5.7, 3.4.11, 3.3.15, 3.2.20 and pgpoolAdmin 3.6.1 officially released (2017/04/28) ===
+
Release notes:
 +
[https://www.pgpool.net/docs/latest/en/html/ English]
 +
[https://www.pgpool.net/docs/latest/ja/html/ Japanese]
  
Pgpool-II 3.6.3, 3.5.7, 3.4.11, 3.3.15, 3.2.20 and pgpoolAdmin 3.6.1 officially released
 
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
== Development ==
 +
 
 +
=== Pgpool-II 4.4 RC1 released (2022/11/22) ===
 +
 
 +
Pgpool-II 4.4 RC1 is now released.  
 +
 
 +
Note that this is not a stable version but just for developers.
  
* 3.6.3:  [http://www.pgpool.net/docs/latest/en/html/release-3-6-3.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-3.html Japanese]
+
V4.4 contains new features and enhancements, including:
* 3.5.7:  [http://www.pgpool.net/docs/latest/en/html/release-3-5-7.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-7.html Japanese]
 
* 3.4.11:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-11.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-11.html Japanese]
 
* 3.3.15:  [http://www.pgpool.net/docs/latest/ja/html/release-3-3-15.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-15.html Japanese]
 
* 3.2.20:  [http://www.pgpool.net/docs/latest/ja/html/release-3-2-20.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-20.html Japanese]
 
  
=== Pgpool-II 3.6.2, 3.5.6, 3.4.10, 3.3.14 and 3.2.19 officially released (2017/03/17) ===
+
* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  
Pgpool-II 3.6.2, 3.5.6, 3.4.10, 3.3.14 and 3.2.19 officially released
+
* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  
* 3.6.2:  [http://www.pgpool.net/docs/latest/en/html/release-3-6-2.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-2.html Japanese]
+
* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
* 3.5.6:  [http://www.pgpool.net/docs/latest/en/html/release-3-5-6.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-6.html Japanese]
 
* 3.4.10:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-10.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-10.html Japanese]
 
* 3.3.14:  [http://www.pgpool.net/docs/latest/ja/html/release-3-3-14.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-14.html Japanese]
 
* 3.2.19:  [http://www.pgpool.net/docs/latest/ja/html/release-3-2-19.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-19.html Japanese]
 
  
=== pgpoolAdmin 3.6.0 officially released (2017/02/28) ===
+
* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  
pgpoolAdmin 3.6.0 is officially released.
+
* Import PostgreSQL 15's SQL parser.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.
 +
 
 +
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
=== pgpool-II 3.6.1, 3.5.5, 3.4.9, 3.3.13, 3.2.18 and 3.1.21 officially released (2016/12/26) ===
+
Release notes:
 +
[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English]
  
These are the latest stable versions of each major branches.  
+
=== Pgpool-II 4.4 beta1 released (2022/11/14) ===
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
Pgpool-II 4.4 beta1 is now released.  
  
* 3.6.1:  [http://www.pgpool.net/docs/latest/en/html/release-3-6-1.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-6-1.html Japanese]
+
Note that this is not a stable version but just for developers.
* 3.5.5:  [http://www.pgpool.net/docs/latest/en/html/release-3-5-5.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-5-5.html Japanese]
 
* 3.4.9:  [http://www.pgpool.net/docs/latest/en/html/release-3-4-9.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-4-9.html Japanese]
 
* 3.3.13:  [http://www.pgpool.net/docs/latest/en/html/release-3-3-13.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-3-13.html Japanese]
 
* 3.2.18:  [http://www.pgpool.net/docs/latest/en/html/release-3-2-18.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-2-18.html Japanese]
 
* 3.1.21:  [http://www.pgpool.net/docs/latest/en/html/release-3-1-21.html English] [http://www.pgpool.net/docs/latest/ja/html/release-3-1-21.html Japanese]
 
  
pgpool-II 3.1.21 is the final release of the 3.1.x. This series has reached "End of Life", and is no longer maintained and does not receive any updates.
+
V4.4 contains new features and enhancements, including:
  
=== pgpool-II 3.6.0 officially released (2016/11/21) ===
+
* Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  
Pgpool-II 3.6.0 is now officially released.
+
* Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  
V3.6's new features are:
+
* Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  
* Improve the behavior of fail-over.
+
* Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
* New PGPOOL SET command has been introduced.
 
* Watchdog is significantly enhanced.
 
* Handling of extended query protocol (e.g. used by Java applications) in streaming replication mode speeds up if many rows are returned in a result set.
 
* Import parser of PostgreSQL 9.6.
 
* In some cases pg_terminate_backend() now does not trigger a fail-over.
 
* Change documentation format from raw HTML to SGML.
 
* etc.
 
  
=== pgpool-II 3.5.4, 3.4.8, 3.3.12, 3.2.17 and 3.1.20 officially released (2016/08/31) ===
+
* Import PostgreSQL 15's SQL parser.
  
These are the latest stable versions of each major branches.  
+
* Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.  
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
* 3.5.4: [http://www.pgpool.net/docs/pgpool-II-3.5.4/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.4/doc/pgpool-ja.html#release3.5.4 Japanese]
+
Release notes:
* 3.4.8:  [http://www.pgpool.net/docs/pgpool-II-3.4.8/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.8/doc/pgpool-ja.html#release3.4.8 Japanese]
+
[https://www.pgpool.net/docs/44/en/html/release-4-4-0.html English]
* 3.3.12:  [http://www.pgpool.net/docs/pgpool-II-3.3.12/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.12/doc/pgpool-ja.html#release3.3.12 Japanese]
 
* 3.2.17:  [http://www.pgpool.net/docs/pgpool-II-3.2.17/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.17/doc/pgpool-ja.html#release3.2.17 Japanese]
 
* 3.1.20: [http://www.pgpool.net/docs/pgpool-II-3.1.20/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.20/doc/pgpool-ja.html#release3.1.20 Japanese]
 
  
=== pgpool-II 3.5.3, 3.4.7, 3.3.11, 3.2.16, 3.1.19, and pgpoolAdmin 3.5.3 officially released (2016/06/17) ===
+
=== Pgpool-II 4.3 RC1 released (2021/11/25) ===
  
These are the latest stable versions of each major branches.  
+
Pgpool-II 4.3 RC1 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3rc1.html 4.3 RC1]
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
Note that this is not a stable version but just for developers.
  
* 3.5.3:  [http://www.pgpool.net/docs/pgpool-II-3.5.3/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.3/doc/pgpool-ja.html#release3.5.3 Japanese]
+
V4.3 contains new features and enhancements, including:
* 3.4.7:  [http://www.pgpool.net/docs/pgpool-II-3.4.7/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.7/doc/pgpool-ja.html#release3.4.7 Japanese]
+
* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
* 3.3.11:  [http://www.pgpool.net/docs/pgpool-II-3.3.11/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.11/doc/pgpool-ja.html#release3.3.11 Japanese]
 
* 3.2.16:  [http://www.pgpool.net/docs/pgpool-II-3.2.16/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.16/doc/pgpool-ja.html#release3.2.16 Japanese]
 
* 3.1.19: [http://www.pgpool.net/docs/pgpool-II-3.1.19/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.19/doc/pgpool-ja.html#release3.1.19 Japanese]
 
  
=== pgpool-II 3.5.2, 3.4.6, 3.3.10, 3.2.15, 3.1.18, and pgpoolAdmin 3.5.2 officially released (2016/04/26) ===
+
* Allow to choose the least replication delay standby node when selecting the load balance node.  
  
These are the latest stable versions of each major branches.  
+
* Allow to specify the node id to be promoted in pcp_promote_node.  
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.  
  
* 3.5.2:  [http://www.pgpool.net/docs/pgpool-II-3.5.2/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.2/doc/pgpool-ja.html#release3.5.2 Japanese]
+
* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
* 3.4.6:  [http://www.pgpool.net/docs/pgpool-II-3.4.6/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.6/doc/pgpool-ja.html#release3.4.6 Japanese]
 
* 3.3.10:  [http://www.pgpool.net/docs/pgpool-II-3.3.10/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.10/doc/pgpool-ja.html#release3.3.10 Japanese]
 
* 3.2.15:  [http://www.pgpool.net/docs/pgpool-II-3.2.15/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.15/doc/pgpool-ja.html#release3.2.15 Japanese]
 
* 3.1.18: [http://www.pgpool.net/docs/pgpool-II-3.1.18/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.18/doc/pgpool-ja.html#release3.1.18 Japanese]
 
  
=== pgpool-II 3.5.1, 3.4.5, 3.3.9, 3.2.14, 3.1.17, and pgpoolAdmin 3.5.1 officially released (2016/04/04) ===
+
* Allow pcp_node_info to list all backend nodes information.
  
These are the latest stable versions of each major branches.  
+
* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.  
  
* 3.5.1:  [http://www.pgpool.net/docs/pgpool-II-3.5.1/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.1/doc/pgpool-ja.html#release3.5.1 Japanese]
+
* Add support for log time stamp with milliseconds.
* 3.4.5:  [http://www.pgpool.net/docs/pgpool-II-3.4.5/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.5/doc/pgpool-ja.html#release3.4.5 Japanese]
 
* 3.3.9:  [http://www.pgpool.net/docs/pgpool-II-3.3.9/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.9/doc/pgpool-ja.html#release3.3.9 Japanese]
 
* 3.2.14:  [http://www.pgpool.net/docs/pgpool-II-3.2.14/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.14/doc/pgpool-ja.html#release3.2.14 Japanese]
 
* 3.1.17: [http://www.pgpool.net/docs/pgpool-II-3.1.17/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.17/doc/pgpool-ja.html#release3.1.17 Japanese]
 
  
=== pgpool-II 3.4.4, 3.3.8, 3.2.13, 3.1.16, and 3.0.20 officially released (2016/02/05) ===
+
* Import PostgreSQL 14's SQL parser.
  
These are the latest stable versions of each major branches.  
+
* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* pgpool.conf sample files are unified into single sample file for easier configuration.
  
* 3.4.4:  [http://www.pgpool.net/docs/pgpool-II-3.4.4/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.4/doc/pgpool-ja.html#release3.4.4 Japanese]
+
* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
* 3.3.8:  [http://www.pgpool.net/docs/pgpool-II-3.3.8/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.8/doc/pgpool-ja.html#release3.3.8 Japanese]
 
* 3.2.13:  [http://www.pgpool.net/docs/pgpool-II-3.2.13/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.13/doc/pgpool-ja.html#release3.2.13 Japanese]
 
* 3.1.16: [http://www.pgpool.net/docs/pgpool-II-3.1.16/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.16/doc/pgpool-ja.html#release3.1.16 Japanese]
 
* 3.0.20: [http://www.pgpool.net/docs/pgpool-II-3.0.20/doc/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.20/doc/pgpool-ja.html#release3.0.20 Japanese]
 
  
pgpool-II 3.0.20 is the final release of the 3.0.x. This series has reached "End of Life", and is no longer maintained and does not receive any updates.
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
=== pgpool-II 3.5.0 and pgpoolAdmin 3.5.0 officially released (2016/01/29) ===
+
Release notes:
 +
[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
  
Pgpool-II 3.5.0 and pgpoolAdmin 3.5.0 are now officially released.
 
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
=== Pgpool-II 4.3 beta2 released (2021/11/18) ===
  
 +
Pgpool-II 4.3 beta2 is now released. Please take a look at [https://www.pgpool.net/docs/43/en/html/release-4-3beta2.html 4.3 beta2]
  
V3.5's new features are:
+
Note that this is not a stable version but just for developers.
  
* Improved performance in extended query protocol
+
V4.3 contains new features and enhancements, including:
* Overcoming the thundering herd problem
+
* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
* watchdog feature enhancements to be more robust and adaptable
 
* PCP command enhancements
 
* Import PostgreSQL 9.5 parser
 
* etc.
 
  
Please see [http://pgpool.net/mediawiki/index.php?title=pgpool-II_3.5_features&redirect=no this] for details.
+
* Allow to choose the least replication delay standby node when selecting the load balance node.  
  
 +
* Allow to specify the node id to be promoted in pcp_promote_node.
  
3.5.0 release note:  [http://www.pgpool.net/docs/pgpool-II-3.5.0/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.5.0/doc/pgpool-ja.html#release3.5.0 Japanese]
+
* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.  
  
=== pgpool-II 3.4.3, 3.3.7, 3.2.12, 3.1.15, and 3.0.19 officially released (2015/07/24) ===
+
* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  
These are the latest stable versions of each major branches.  
+
* Allow pcp_node_info to list all backend nodes information.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  
* 3.4.3:  [http://www.pgpool.net/docs/pgpool-II-3.4.3/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.3/doc/pgpool-ja.html#release3.4.3 Japanese]
+
* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.  
* 3.3.7:  [http://www.pgpool.net/docs/pgpool-II-3.3.7/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.7/doc/pgpool-ja.html#release3.3.7 Japanese]
 
* 3.2.12:  [http://www.pgpool.net/docs/pgpool-II-3.2.12/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.12/doc/pgpool-ja.html#release3.2.12 Japanese]
 
* 3.1.15: [http://www.pgpool.net/docs/pgpool-II-3.1.15/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.15/doc/pgpool-ja.html#release3.1.15 Japanese]
 
* 3.0.19: [http://www.pgpool.net/docs/pgpool-II-3.0.19/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.19/doc/pgpool-ja.html#release3.0.19 Japanese]
 
  
 +
* Add support for log time stamp with milliseconds.
  
=== pgpool-II 3.4.2, 3.3.6, 3.2.11, 3.1.14, and 3.0.18 officially released (2015/04/08) ===
+
* Import PostgreSQL 14's SQL parser.
  
These are the latest stable versions of each major branches.  
+
* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* pgpool.conf sample files are unified into single sample file for easier configuration.
  
* 3.4.2:  [http://www.pgpool.net/docs/pgpool-II-3.4.2/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.2/doc/pgpool-ja.html#release3.4.2 Japanese]
+
* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
* 3.3.6:  [http://www.pgpool.net/docs/pgpool-II-3.3.6/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.6/doc/pgpool-ja.html#release3.3.6 Japanese]
 
* 3.2.11:  [http://www.pgpool.net/docs/pgpool-II-3.2.11/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.11/doc/pgpool-ja.html#release3.2.11 Japanese]
 
* 3.1.14: [http://www.pgpool.net/docs/pgpool-II-3.1.14/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.14/doc/pgpool-ja.html#release3.1.14 Japanese]
 
* 3.0.18: [http://www.pgpool.net/docs/pgpool-II-3.0.18/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.18/doc/pgpool-ja.html#release3.0.18 Japanese]
 
  
=== pgpool-II 3.4.1, 3.3.5, 3.2.10, 3.1.13, 3.0.17  and pgpoolAdmin 3.4.1 officially released (2015/02/05) ===
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
These are the latest stable versions of each major branches.  
+
Release notes:
 +
[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
=== Pgpool-II 4.3 beta1 released (2021/11/09) ===
  
* 3.4.1:  [http://www.pgpool.net/docs/pgpool-II-3.4.1/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.1/doc/pgpool-ja.html#release3.4.1 Japanese]
+
Pgpool-II 4.3 beta1 is now released.  
* 3.3.5:  [http://www.pgpool.net/docs/pgpool-II-3.3.5/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.5/doc/pgpool-ja.html#release3.3.5 Japanese]
 
* 3.2.10:  [http://www.pgpool.net/docs/pgpool-II-3.2.10/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.10/doc/pgpool-ja.html#release3.2.10 Japanese]
 
* 3.1.13: [http://www.pgpool.net/docs/pgpool-II-3.1.13/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.13/doc/pgpool-ja.html#release3.1.13 Japanese]
 
* 3.0.17: [http://www.pgpool.net/docs/pgpool-II-3.0.17/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.17/doc/pgpool-ja.html#release3.0.17 Japanese]
 
  
* pgpoolAdmin 3.4.1: [http://www.pgpool.net/docs/pgpoolAdmin-3.4.1/NEWS.txt English]
+
Note that this is not a stable version but just for developers.
  
=== The pgpool-II official yum repository released (2014/12/16) ===
+
V4.3 contains new features and enhancements, including:
 +
* A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  
PgPool Global Development Group announced the pgpool-II official yum repository.
+
* Allow to choose the least replication delay standby node when selecting the load balance node.  
With this repository, you will be able to install or update pgpool-II and pgpoolAdmin etc. by using yum.
 
  
http://www.pgpool.net/yum/
+
* Allow to specify the node id to be promoted in pcp_promote_node.  
  
The yum repository currently supports pgpool-II 3.3 or above with RHEL6 x86_64.  
+
* Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.  
  
See [[Yum Repository]] for detail.
+
* Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  
=== pgpool-II 3.4.0 and pgpoolAdmin 3.4.0 officially released (2014/11/07) ===
+
* Allow pcp_node_info to list all backend nodes information.
  
Pgpool-II 3.4.0 is now officially released.
+
* Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.  
  
 +
* Add support for log time stamp with milliseconds.
  
V3.4's new features are:
+
* Import PostgreSQL 14's SQL parser.
  
* Allow fine control of load balancing by using application name or database name
+
* Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
* New features about log output
 
** Allow to print pgpool-II process names
 
**  Allow to control log verbosity like PostgreSQL
 
* SQL parser compatible with PostgreSQL 9.4
 
* Import PostgreSQL's memory manager and exception manager
 
* Support IPv6 address
 
* Reorganize source code tree
 
* etc.  
 
  
 +
* pgpool.conf sample files are unified into single sample file for easier configuration.
  
* 3.4.0 release note:  [http://www.pgpool.net/docs/pgpool-II-3.4.0/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.4.0/doc/pgpool-ja.html#release3.4.0 Japanese]
+
* All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.
  
=== pgpool-II 3.3.4, 3.2.9, 3.1.12, and 3.0.16 are officially released (2014/09/05) ===
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
These are the latest stable versions of each major branches.  
+
Release notes:
 +
[https://www.pgpool.net/docs/43/en/html/release-4-3-0.html English]
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
=== Pgpool-II 4.2 beta1 released (2020/10/27) ===
  
* 3.3.4:  [http://www.pgpool.net/docs/pgpool-II-3.3.4/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.4/doc/pgpool-ja.html#release3.3.4 Japanese]
+
Pgpool-II 4.2 beta1 is now released.  
* 3.2.9:  [http://www.pgpool.net/docs/pgpool-II-3.2.9/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.9/doc/pgpool-ja.html#release3.2.9 Japanese]
 
* 3.1.12: [http://www.pgpool.net/docs/pgpool-II-3.1.12/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.12/doc/pgpool-ja.html#release3.1.12 Japanese]
 
* 3.0.16: [http://www.pgpool.net/docs/pgpool-II-3.0.16/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.16/doc/pgpool-ja.html#release3.0.16 Japanese]
 
  
=== pgpool-ha 2.2 released (2014/04/01) ===
+
Note that this is not a stable version but just for developers.
  
This is the latest stable version.
+
V4.2 contains new features and enhancements, including:
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads#pgpool-HA here].
+
* Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  
 +
* Implement logging_collector for easier log management.
  
=== pgpool-II 3.3.3, 3.2.8, 3.1.11, 3.0.15  and pgpoolAdmin 3.3.1 officially released (2014/03/24) ===
+
* Implement log_disconnections to collect disconnection logs.
  
These are the latest stable versions of each major branches.  
+
* Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  
* 3.3.3:  [http://www.pgpool.net/docs/pgpool-II-3.3.3/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.3/doc/pgpool-ja.html#release3.3.3 Japanese]
+
* New PCP command pcp_reload_config is added.
* 3.2.8:  [http://www.pgpool.net/docs/pgpool-II-3.2.8/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.8/doc/pgpool-ja.html#release3.2.8 Japanese]
 
* 3.1.11: [http://www.pgpool.net/docs/pgpool-II-3.1.11/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.11/doc/pgpool-ja.html#release3.1.11 Japanese]
 
* 3.0.15: [http://www.pgpool.net/docs/pgpool-II-3.0.15/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.15/doc/pgpool-ja.html#release3.0.15 Japanese]
 
  
* pgpoolAdmin 3.3.1: [http://www.pgpool.net/docs/pgpoolAdmin-3.3.1/NEWS.txt English]
+
* Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  
=== pgpool-II 3.2.7, 3.1.10, 3.0.14 officially released (2013/12/06) ===
+
* Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
  
These are the latest stable versions of each major branches.  
+
* Support LDAP authentication between clients and Pgpool-II.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  
* 3.2.7:  [http://www.pgpool.net/docs/pgpool-II-3.2.7/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.2.7/doc/pgpool-ja.html#release3.2.7 Japanese]
+
* Import PostgreSQL 13's SQL parser.  
* 3.1.10: [http://www.pgpool.net/docs/pgpool-II-3.1.10/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.1.10/doc/pgpool-ja.html#release3.1.10 Japanese]
 
* 3.0.14: [http://www.pgpool.net/docs/pgpool-II-3.0.14/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.0.14/doc/pgpool-ja.html#release3.0.14 Japanese]
 
  
=== pgpool-II 3.3.2 officially released (2013/11/29) ===
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
These are the latest stable version of 3.3.
+
Release notes:
 +
[https://www.pgpool.net/docs/42/en/html/release-4-2-0.html English]
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
=== Pgpool-II 4.2 alpha1 released (2020/10/06) ===
  
* 3.3.2: [http://www.pgpool.net/docs/pgpool-II-3.3.2/NEWS.txt English] [http://www.pgpool.net/docs/pgpool-II-3.3.2/doc/pgpool-ja.html#release3.0.7 Japanese]
+
Pgpool-II 4.2 alpha1 is now released.  
  
=== pgpool-II 3.3.1, 3.2.6, 3.1.9, 3.0.13 officially released (2013/09/06) ===
+
Note that this is not a stable version but just for developers.
  
These are the latest stable versions of each major branches.  
+
V4.2 contains new features and enhancements, including:
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  
=== Missing regression test suite in pgpool-II 3.3.0.tar.gz (2013/07/31) ===
+
* Implement logging_collector for easier log management.
  
New regression test suite was not accidentally included in the pgpool-II 3.3.0.tar.gz tar ball.
+
* Implement log_disconnections to collect disconnection logs.
You can get it from git repository or download from
 
[http://www.pgpool.net/download.php?f=regression-3.3.0.tar.gz here].
 
  
=== pgpool-II 3.3 and pgpoolAdmin 3.3 officially released (2013/07/30) ===
+
* Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  
Pgpool-II 3.3 is now officially released.
+
* Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
* New PCP command pcp_reload_config is added.
  
V3.3's new features are:
+
* Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  
* Enhancements for watchdog
+
* Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
** New monitoring method of watchdog lifecheck using heartbeat signal
 
** Interlocking of failover/failback script
 
** Secure watchdog communication
 
** PCP command for retrieving the watchdog status
 
** etc.
 
* Othres
 
** Import PostgreSQL 9.2 raw parser
 
** New pgpool_setup tool
 
** Support for using CREATE EXTENSION to install pgpool specific extensions
 
** regression test suit
 
** etc.  
 
  
* [http://www.pgpool.net/docs/pgpool-II-3.3.0/NEWS.txt pgpool-II 3.3 release note (English)]
+
* Support LDAP authentication between clients and Pgpool-II.
* [http://www.pgpool.net/docs/pgpool-II-3.3.0/pgpool-ja.html#release3.3.0 pgpool-II 3.3 release note (Japanese)]
 
  
=== pgpool-II 3.2.5, 3.1.8, 3.0.12 officially released (2013/07/10) ===
+
* Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  
These are the latest stable versions of each major branches.  
+
* Import PostgreSQL 13's SQL parser.  
  
You can download them [http://pgpool.net/mediawiki/index.php/Downloads here].
+
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
  
== Development ==
+
Release notes:
 +
[https://www.pgpool.net/docs/42/en/html/release-4-2-0.html English]
  
 
=== Pgpool-II 4.1 RC1 released (2019/10/16) ===
 
=== Pgpool-II 4.1 RC1 released (2019/10/16) ===
  
Pgpool-II 4.1 RC1 is now relased.  
+
Pgpool-II 4.1 RC1 is now released.  
  
 
This is not intended to be used in production but is close to the release version. So users are encouraged to test it out.  
 
This is not intended to be used in production but is close to the release version. So users are encouraged to test it out.  
Line 770: Line 716:
 
=== Pgpool-II 4.1 beta1 released (2019/09/06) ===
 
=== Pgpool-II 4.1 beta1 released (2019/09/06) ===
  
Pgpool-II 4.1 beta1 is now relased.  
+
Pgpool-II 4.1 beta1 is now released.  
  
 
This is not a stable version but just for developers.
 
This is not a stable version but just for developers.
Line 790: Line 736:
 
Release notes:
 
Release notes:
 
[https://www.pgpool.net/docs/41/en/html/ English]
 
[https://www.pgpool.net/docs/41/en/html/ English]
 
=== Pgpool-II 4.0 RC1 released (2018/10/03) ===
 
 
Pgpool-II 4.0 RC1 is now relased.
 
 
This is not intended to be used in production but is close to the release version. So users are encouraged to test it out.
 
 
V4.0 has new features:
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
* Import PostgreSQL 11 SQL parser.
 
* Logging client messages.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
 
 
=== Pgpool-II 4.0 beta1 released (2018/09/19) ===
 
 
Pgpool-II 4.0 beta1 is now relased.
 
 
This is not a stable version but just for developers.
 
 
V4.0 has new features:
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
* Import PostgreSQL 11 SQL parser.
 
* Logging client messages.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
 
 
=== Pgpool-II 4.0 alpha2 released (2018/09/06) ===
 
 
Pgpool-II 4.0 alpha2 is now relased.
 
 
This is not a stable version but just for developers.
 
 
V4.0 has new features:
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
* Import PostgreSQL 11 SQL parser.
 
* Logging client messages.
 
* etc.
 
 
You can download it from [https://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
 
 
=== Pgpool-II 4.0 alpha1 released (2018/08/20) ===
 
 
Pgpool-II 4.0 alpha1 is now relased.
 
 
This is not a stable version but just for developers.
 
 
V4.0 has new features:
 
 
* Add SCRAM and Certificate authentication support.
 
* Detecting "false" primary server of PostgreSQL.
 
* Improvements to load balancing:
 
** More load balancing fine control after write queries.
 
** Load balancing control for specific queries.
 
** Allow to specify load balance weight ratio for load balance parameters.
 
* Add last state change timestamp to SHOW POOL NODES.
 
*Logging client messages.
 
* etc.
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[https://www.pgpool.net/docs/pgpool-II-4.0/en/html/release-4-0.html English]
 
 
=== Pgpool-II 3.7 RC1 and pgpoolAdmin 3.7 RC1 released (2017/11/13) ===
 
 
Pgpool-II 3.7 RC1 and pgpoolAdmin 3.7 RC1 are now relased.
 
 
This is not intended to be used in production but is close to the
 
release version. So users are encouraged to test it out.
 
 
V3.7 has new features:
 
* Quorum aware failover feature.
 
* Allow specifying the hostnames in pool_hba.
 
* Allow to specify per node health check parameters.
 
* Support AWS Aurora.
 
* Import PostgreSQL 10 SQL parser.
 
* Support logical replication.
 
* etc.
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
Release notes:
 
[http://www.pgpool.net/docs/pgpool-II-3.7.0/doc/en/html/release-3-7.html English] [http://www.pgpool.net/docs/pgpool-II-3.7.0/doc/ja/html/release-3-7.html Japanese]
 
 
=== Pgpool-II 3.7 beta1 released (2017/10/17) ===
 
 
Pgpool-II 3.7 beta1 is now relased. This is not a stable version but just for developers.
 
 
V3.7 has new features:
 
* Quorum aware failover feature.
 
* Allow specifying the hostnames in pool_hba.
 
* Allow to specify per node health check parameters.
 
* Support AWS Aurora.
 
* Import PostgreSQL 10 SQL parser.
 
* Support logical replication.
 
* etc.
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.6 RC1 released (2016/11/16) ===
 
 
pgpool-II 3.6 RC1 is now relased. This is not a stable version but just for developers.
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.6 beta2 released (2016/11/08) ===
 
 
pgpool-II 3.6 beta2 is now relased. This is not a stable version but just for developers.
 
 
Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.6 better!
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.6 beta1 released (2016/11/02) ===
 
 
pgpool-II 3.6 beta1 is now relased. This is not a stable version but just for developers.
 
 
Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.6 better!
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== Pgpool-II 3.6 alpha1 released (2016/10/19) ===
 
 
Pgpool-II 3.6 alpha1 is now relased. This is not a stable version but just for developers.
 
 
V3.6 has a new feature:
 
* Improve the behavior of fail-over.
 
* New PGPOOL SET command has been introduced.
 
* Watchdog is significantly enhanced.
 
* Handling of extended query protocol (e.g. used by Java applications) in streaming replication mode speeds up if many rows are returned in a result set.
 
* Import parser of PostgreSQL 9.6.
 
* In some cases pg_terminate_backend() now does not trigger a fail-over.
 
* Change documentation format from raw HTML to SGML.
 
* etc.
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.5 RC1 released (2016/1/14) ===
 
 
pgpool-II 3.5 RC1 and pgpoolAdmin 3.5 RC1 are now relased. This is not a stable version but just for developers.
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.5 beta1 released (2015/12/14) ===
 
 
pgpool-II 3.5 beta1 and pgpoolAdmin 3.5 beta1 are now relased. This is not a stable version but just for developers.
 
 
Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.5 better!
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.5 alpha1 released (2015/11/16) ===
 
 
Pgpool-II 3.5 alpha1 is now relased. This is not a stable version but just for developers.
 
 
V3.5 has a new feature:
 
* Improved performance in extended query protocol
 
* Overcoming the thundering herd problem
 
* watchdog feature enhancements to be more robust and adaptable
 
* PCP command enhancements
 
* Import PostgreSQL 9.5 parser
 
* etc.
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
 
=== pgpool-II 3.3 RC1 released (2013/07/25) ===
 
 
Pgpool-II 3.3 RC1 is now relased. This is not a stable version but just for developers.
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.3 beta1 released (2013/06/12) ===
 
 
Pgpool-II 3.3 beta1 is now relased. This is not a stable version but just for developers.
 
 
Users are encouraged to take part in our beta test program. Please help us in testing and making pgpool-II 3.3 better!
 
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
 
=== pgpool-II 3.3 alpha1 released (2013/05/17) ===
 
 
Pgpool-II 3.3 alpha1 is now relased. This is not a stable version but just for developers.
 
 
V3.3 has a new feature:
 
* Enhancements for watchdog
 
** New monitoring method of watchdog lifecheck using heartbeat signal
 
** Interlocking of failover/failback script
 
** Secure watchdog communication
 
** etc.
 
* Othres
 
** Import PostgreSQL 9.2 raw parser
 
** New pgpool_setup tool
 
** Support for using CREATE EXTENSION to install pgpool specific extensions
 
You can download it from [http://pgpool.net/mediawiki/index.php/Developer_releases here].
 
  
 
== Old ==
 
== Old ==
 
See [[Old news|this page]].
 
See [[Old news|this page]].
  
= Where can I get commercial support for pgpool-II? =
+
= Where can I get commercial support for Pgpool-II? =
  
Some commercial packages include pgpool-II support. Consulting and annual support can be purchased from SRA OSS, Inc. Japan (http://www.sraoss.co.jp/index_en.php).
+
Some commercial packages include Pgpool-II support. Consulting and annual support can be purchased from SRA OSS, Inc. Japan (https://www.sraoss.co.jp/index_en.php).

Latest revision as of 06:08, 6 December 2022


Contents

Welcome to Pgpool Wiki!

What is Pgpool-II?

Pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client. It is distributed under a license similar to BSD and MIT. It provides the following features.

  • Connection Pooling
Pgpool-II saves connections to the PostgreSQL servers, and reuse them whenever a new connection with the same properties (i.e. username, database, protocol version) comes in. It reduces connection overhead, and improves system's overall throughput.
  • Replication
Pgpool-II can manage multiple PostgreSQL servers. Using the replication function enables creating a realtime backup on 2 or more physical disks, so that the service can continue without stopping servers in case of a disk failure.
  • Load Balancing
If a database is replicated, executing a SELECT query on any server will return the same result. Pgpool-II takes an advantage of the replication feature to reduce the load on each PostgreSQL server by distributing SELECT queries among multiple servers, improving system's overall throughput. At best, performance improves proportionally to the number of PostgreSQL servers. Load balance works best in a situation where there are a lot of users executing many queries at the same time.
  • Limiting Exceeding Connections
There is a limit on the maximum number of concurrent connections with PostgreSQL, and connections are rejected after this many connections. Setting the maximum number of connections, however, increases resource consumption and affect system performance. pgpool-II also has a limit on the maximum number of connections, but extra connections will be queued instead of returning an error immediately.
  • Watchdog
Watchdog can coordinate multiple Pgpool-II, create a robust cluster system and avoid the single point of failure or split brain. Watchdog can perform lifecheck against other pgpool-II nodes, to detect a fault of Pgpoll-II. If active Pgpool-II goes down, standby Pgpool-II can be promoted to active, and take over Virtual IP.
  • In Memory Query Cache
In memory query cache allows to save a pair of SELECT statement and its result. If an identical SELECTs comes in, Pgpool-II returns the value from cache. Since no SQL parsing nor access to PostgreSQL are involved, using in memory cache is extremely fast. On the other hand, it might be slower than the normal path in some cases, because it adds some overhead of storing cache data.

Pgpool-II speaks PostgreSQL's backend and frontend protocol, and relays messages between a backend and a frontend. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a

Pgpool-II talks PostgreSQL's backend and frontend protocol, and relays a connection between them. Therefore, a database application (frontend) thinks that Pgpool-II is the actual PostgreSQL server, and the server (backend) sees Pgpool-II as one of its clients. Because Pgpool-II is transparent to both the server and the client, an existing database application can be used with Pgpool-II almost without a change to its sources.

Pgpool-II License

See License.

Stable versions

  • Pgpool-II: 4.4, 4.3, 4.2, 4.1, 4.0, 3.7
  • pgpoolAdmin: 4.2, 4.1, 4.0, 3.7

Contacts

  • If you have technical questions regarding Pgpool-II, please subscribe Pgpool-II mailing lists and send questions to it (pgpool-general will be a starter). Please do not send technical questions via private email. We will not respond such that messages.
  • If you believe that you found a vulnerability/security issues with Pgpool-II, please send a private email to ishii at sraoss.co.jp (he is the project leader).

What's new

News

Pgpool-II 4.4.0 released (2022/12/06)

Pgpool-II 4.4.0 is now released. This is the first stable release of Pgpool-II 4.4.x.

V4.4 contains new features and enhancements, including:

  • Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  • Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  • As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  • Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  • Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  • Import PostgreSQL 15's SQL parser.
  • Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English Japanese

Events

PGConf.ASIA 2019 in Bali

Bo Peng is going to give a presentation Setup a High-Availability and Load Balancing PostgreSQL Cluster: New Features of Pgpool-II 4.1 at "PGConf.ASIA 2019" held in Bali from September 8th to 11st.

PGConf.ASIA 2018 in Tokyo

Tatsuo Ishii and Bo Peng are going to give a presentation Celebrating its 15th Anniversary Pgpool-II Past Present and Future Celebrating its 15th Anniversary Pgpool-II Past Present and Future part2 at "PGConf.ASIA 2018" held in Tokyo from December 10th to 12th.

PGConf.ASIA 2017 in Tokyo

Tatsuo Ishii is going to give a presentation "More reliability and support for PostgreSQL 10: Introducing Pgpool-II 3.7" at "PGConf.ASIA 2017", held in Tokyo from December 4th to 6th.

PostgreSQL Conference in Russia 2016

Tatsuo gave a talk "How to manage a herd of elephants" at "PostgreSQL Conference in Russia 2016", held in Moscow from February 4th to 5th. The slides are available in Developer's documentation.

PostgreSQL Conference in China 2015

Tatsuo gave a talk "How to manage a herd of elephants" at "PostgreSQL Conference in China 2015", held in Beijing from November 21th to 22th. The slides are available in Developer's documentation.

pgCon 2015 Cluster Hacker Summit

We participated "6th Postgres Cluster Hacker Summit" which was held as a part of PgCon 2015 Developer Unconference. We reported about Development Status Updates and pgpool-II 3.5 features. The slides are available in Developer's documentation.

Pgpool-II Day 2015 in Tokyo

We had the very first time pgpool-II decicated conference. See the event report.

Stable

Pgpool-II 4.4.0 released (2022/12/06)

Pgpool-II 4.4.0 is now released. This is the first stable release of Pgpool-II 4.4.x.

V4.4 contains new features and enhancements, including:

  • Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  • Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  • As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  • Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  • Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  • Import PostgreSQL 15's SQL parser.
  • Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English Japanese

Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released (2022/08/18)

Pgpool-II 4.3.3, 4.2.10, 4.1.13, 4.0.20 and 3.7.25 officially released.

You can download them here.

Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released (2022/05/19)

Pgpool-II 4.3.2, 4.2.9, 4.1.12, 4.0.19 and 3.7.24 officially released.

You can download them here.

Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released (2022/02/17)

Pgpool-II 4.3.1, 4.2.8, 4.1.11, 4.0.18 and 3.7.23 officially released.

You can download them here.

Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released (2021/12/23)

Pgpool-II 4.2.7, 4.1.10, 4.0.17 and 3.7.22 officially released.

The purpose of this release is to provide packages for PostgreSQL 14.

You can download them here.

Pgpool-II 4.3.0 released (2021/12/07)

Pgpool-II 4.3.0 is now released. Please take a look at 4.3.0

V4.3.0 contains new features and enhancements, including:

  • A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  • Allow to choose the least replication delay standby node when selecting the load balance node.
  • Allow to specify the node id to be promoted in pcp_promote_node.
  • Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
  • Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  • Allow pcp_node_info to list all backend nodes information.
  • Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  • Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
  • Add support for log time stamp with milliseconds.
  • Import PostgreSQL 14's SQL parser.
  • Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  • pgpool.conf sample files are unified into single sample file for easier configuration.
  • All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released (2021/11/18)

Pgpool-II 4.2.6, 4.1.9, 4.0.16, 3.7.21 and 3.6.28 officially released.

You can download them here.

Pgpool-II 4.2.5 released (2021/09/14)

Pgpool Global Development Group is pleased to announce the availability of Pgpool-II 4.2.5.

You can download them here.

Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released (2021/08/05)

Pgpool-II 4.2.4, 4.1.8, 4.0.15, 3.7.20 and 3.6.27 officially released.

You can download them here.

pgpoolAdmin 4.2.0 officially released (2021/06/17)

pgpoolAdmin 4.2.0 officially released.

pgpoolAdmin 4.2.0 adds support for Pgpool-II 4.2. Please take a look at release notes.

You can download them here.

Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released (2021/05/20)

Pgpool-II 4.2.3, 4.1.7, 4.0.14, 3.7.19 and 3.6.26 officially released.

You can download them here.

Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released (2021/02/18)

Pgpool-II 4.2.2, 4.1.6, 4.0.13, 3.7.18 and 3.6.25 officially released.

You can download them here.

Pgpool-II 4.2.1 released (2020/12/23)

Pgpool-II 4.2.1 is now released.

You can download them from here.

Pgpool-II 4.2.0 released (2020/11/26)

Pgpool-II 4.2.0 is now released.

V4.2 contains new features and enhancements, including:

  • Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  • Implement logging_collector for easier log management.
  • Implement log_disconnections to collect disconnection logs.
  • Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  • Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  • New PCP command pcp_reload_config is added.
  • Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  • Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
  • Support LDAP authentication between clients and Pgpool-II.
  • Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  • Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released (2020/11/19)

Pgpool-II 4.1.5, 4.0.12, 3.7.17, 3.6.24 and 3.5.28 officially released

You can download them here.

Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released (2020/09/17)

Pgpool-II 4.1.4, 4.0.11, 3.7.16, 3.6.23 and 3.5.27 officially released

You can download them here.

Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released (2020/08/20)

Pgpool-II 4.1.3, 4.0.10, 3.7.15, 3.6.22 and 3.5.26 officially released

You can download them here.

Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released (2020/05/21)

Pgpool-II 4.1.2, 4.0.9, 3.7.14, 3.6.21 and 3.5.25 officially released

You can download them here.

Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released (2020/02/20)

Pgpool-II 4.1.1, 4.0.8, 3.7.13, 3.6.20, 3.5.24 and pgpoolAdmin 4.1.0 officially released

You can download them here.

Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 officially released (2019/11/19)

Pgpool-II 4.1.0, 4.0.7, 3.7.12, 3.6.19, 3.5.23 and 3.4.26 RPMs Update 2 are officially released. The updated RPM packages fixed the bug which logs are not output, when log_destination = 'syslog' is configured.

You can download them here.

Pgpool-II 4.1.0 released (2019/10/31)

Pgpool-II 4.1.0 is now relased.

Major enhancements in Pgpool-II 4.1 include:

  • Statement level load balancing.
  • Auto failback.
  • Enhance performance in number of areas.
    • Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
    • Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
    • Load balancing control for specific queries.
  • Reduce Internal Queries against System Catalogs.
  • Import PostgreSQL 12 SQL parser.
  • etc.

You can download it from here.

Release notes: English Japanese


Development

Pgpool-II 4.4 RC1 released (2022/11/22)

Pgpool-II 4.4 RC1 is now released.

Note that this is not a stable version but just for developers.

V4.4 contains new features and enhancements, including:

  • Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  • Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  • As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  • Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  • Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  • Import PostgreSQL 15's SQL parser.
  • Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English

Pgpool-II 4.4 beta1 released (2022/11/14)

Pgpool-II 4.4 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.4 contains new features and enhancements, including:

  • Add new dynamic spare process management feature. This feature allows selecting between static and dynamic process management modes.
  • Allow to specify replication delay by time in streaming replication mode. For this purpose new parameter delay_threshold_by_time is introduced.
  • As PostgreSQL already does, Pgpool-II now supports unix_socket_directories, unix_socket_group and unix_socket_permissions for more flexible and precise control of UNIX domain sockets.
  • Allow to use comma separated multiple listen addresses in listen_addresses and pcp_listen_addresses. They control which interfaces accept connection attempts, which can help prevent repeated malicious connection requests on insecure network interfaces.
  • Allow to customize the command used by trusted_servers for checking upstream connection. For this purpose new parameter trusted_server_command is introduced.
  • Import PostgreSQL 15's SQL parser.
  • Speed up query cache by reducing lock contention. This allows concurrent running clients to fetch cache contents much more quicker.

You can download it from here.

Release notes: English

Pgpool-II 4.3 RC1 released (2021/11/25)

Pgpool-II 4.3 RC1 is now released. Please take a look at 4.3 RC1

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

  • A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  • Allow to choose the least replication delay standby node when selecting the load balance node.
  • Allow to specify the node id to be promoted in pcp_promote_node.
  • Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
  • Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  • Allow pcp_node_info to list all backend nodes information.
  • Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  • Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
  • Add support for log time stamp with milliseconds.
  • Import PostgreSQL 14's SQL parser.
  • Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  • pgpool.conf sample files are unified into single sample file for easier configuration.
  • All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English


Pgpool-II 4.3 beta2 released (2021/11/18)

Pgpool-II 4.3 beta2 is now released. Please take a look at 4.3 beta2

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

  • A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  • Allow to choose the least replication delay standby node when selecting the load balance node.
  • Allow to specify the node id to be promoted in pcp_promote_node.
  • Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
  • Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  • Allow pcp_node_info to list all backend nodes information.
  • Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  • Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
  • Add support for log time stamp with milliseconds.
  • Import PostgreSQL 14's SQL parser.
  • Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  • pgpool.conf sample files are unified into single sample file for easier configuration.
  • All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.3 beta1 released (2021/11/09)

Pgpool-II 4.3 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.3 contains new features and enhancements, including:

  • A new membership mechanism is introduced to Watchdog to allow to keep quorum/VIP when some of watchdog nodes are removed.
  • Allow to choose the least replication delay standby node when selecting the load balance node.
  • Allow to specify the node id to be promoted in pcp_promote_node.
  • Allow to configure to not trigger failover when PostgreSQL is shutdown by admin or killed by pg_terminate_backend.
  • Add new fields to pcp_proc_info, SHOW POOL_PROCESSES and SHOW POOL_POOLS command to display more useful information to admin.
  • Allow pcp_node_info to list all backend nodes information.
  • Add new fields showing actual PostgreSQL status to SHOW POOL NODES command and friends.
  • Add a new parameter which represents the recovery source hostname to recovery_1st_stage_command and recovery_2nd_stage_command.
  • Add support for log time stamp with milliseconds.
  • Import PostgreSQL 14's SQL parser.
  • Support include directive in pgppol.conf file. You can have separate sub-config file to be included in pgpool.conf.
  • pgpool.conf sample files are unified into single sample file for easier configuration.
  • All configuration parameters in pgpool.conf sample file are commented out to clarify which parameter is needed to be changed.

You can download it from here.

Release notes: English

Pgpool-II 4.2 beta1 released (2020/10/27)

Pgpool-II 4.2 beta1 is now released.

Note that this is not a stable version but just for developers.

V4.2 contains new features and enhancements, including:

  • Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  • Implement logging_collector for easier log management.
  • Implement log_disconnections to collect disconnection logs.
  • Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  • Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  • New PCP command pcp_reload_config is added.
  • Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  • Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
  • Support LDAP authentication between clients and Pgpool-II.
  • Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  • Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.2 alpha1 released (2020/10/06)

Pgpool-II 4.2 alpha1 is now released.

Note that this is not a stable version but just for developers.

V4.2 contains new features and enhancements, including:

  • Some items in the configuration file pgpool.conf are vastly enhanced for easier configuration and administration.
  • Implement logging_collector for easier log management.
  • Implement log_disconnections to collect disconnection logs.
  • Implement pg_enc and pg_md5 to allow to register multiple passwords at once.
  • Allow to show statistics of health check by using SHOW POOL_HEALTH_CHECK_STATS command, and also allow to show statistics of issued SQL by using SHOW POOL_BACKEND_STATS command.
  • New PCP command pcp_reload_config is added.
  • Now it is possible to omit write_function_list and read_only_function_list by looking at system catalog information.
  • Add new clustering mode snapshot_isolation_mode which guarantees not only data modifications to multiple PostgreSQL but read consistency.
  • Support LDAP authentication between clients and Pgpool-II.
  • Add ssl_crl_file and ssl_passphrase_command to SSL configuration.
  • Import PostgreSQL 13's SQL parser.

You can download it from here.

Release notes: English

Pgpool-II 4.1 RC1 released (2019/10/16)

Pgpool-II 4.1 RC1 is now released.

This is not intended to be used in production but is close to the release version. So users are encouraged to test it out.

Major enhancements in Pgpool-II 4.1 include:

  • Statement level load balancing.
  • Auto failback.
  • Enhance performance in number of areas.
    • Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
    • Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
    • Load balancing control for specific queries.
  • Reduce Internal Queries against System Catalogs.
  • Import PostgreSQL 12 SQL parser.
  • etc.

You can download it from here.

Release notes: English

Pgpool-II 4.1 beta1 released (2019/09/06)

Pgpool-II 4.1 beta1 is now released.

This is not a stable version but just for developers.

Major enhancements in Pgpool-II 4.1 include:

  • Statement level load balancing.
  • Auto failback.
  • Enhance performance in number of areas.
    • Shared relation cache allows to reuse relation cache among sessions to reduce internal queries against PostgreSQL system catalogs.
    • Have separate SQL parser for DML statements to eliminate unnecessary parsing effort.
    • Load balancing control for specific queries.
  • Reduce Internal Queries against System Catalogs.
  • Import PostgreSQL 12 SQL parser.
  • etc.

You can download it from here.

Release notes: English

Old

See this page.

Where can I get commercial support for Pgpool-II?

Some commercial packages include Pgpool-II support. Consulting and annual support can be purchased from SRA OSS, Inc. Japan (https://www.sraoss.co.jp/index_en.php).